| ATLAS Slides | |
| Report number | ATL-PHYS-SLIDE-2025-404 |
| Title | Measurement of the high-mass tau-tau production cross-section and constraints on Leptoquarks, Z' bosons, and effective couplings |
| Author(s) | Koch, Simon Florian (University of Oxford (GB)) |
| Corporate author(s) | The ATLAS collaboration |
| Collaboration | ATLAS Collaboration |
| Submitted to | The 32nd International Symposium on Lepton Photon Interactions at High Energies (Lepton Photon 2025), Madison, Wisconsin, Us, 25 - 29 Aug 2025 |
| Submitted by | simon.florian.koch@cern.ch on 28 Aug 2025 |
| Subject category | Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN LHC ; ATLAS |
| Free keywords | Drell-Yan ; Tau lepton ; Unfolded differential cross-section ; Leptoquark ; Z-prime boson ; Effective field theory ; EXOTICS |
| Abstract | The production of high-mass 𝜏-lepton pairs constitutes a very effective process to probe the Standard Model flavour sector and to search for new physics. The first measurement of the high-mass $\tau \bar{\tau}$ production cross section is presented, performed by the ATLAS Collaboration with the dataset of 140 fb-1 of pp collisions at $\sqrt{s} = 13$~TeV. New physics models are constrained through a fit to the di-tau invariant mass distribution as a function of b-jet multiplicity. Exclusion contours are presented, constraining the leptoquark models proposed to interpret the flavour anomalies in B hadron decays, as well as the production of Z’ bosons that couple preferentially to third-generation fermions. Additionally, constraints on effective field theory operators describing new particles are presented, including those affecting g-2 of the 𝜏 lepton. |
Record created 2025-08-28, last modified 2025-08-29
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